Sole structure for an article of footwear with abrasion resistant outsole and method of manufacturing same

ABSTRACT

A sole structure for an article of footwear includes an outsole that has a body with a lateral side and a medial side, and has a plurality of tread elements extending from the body to establish a ground contact surface. At least some of the tread elements extend between the lateral side and the medial side and each include a front face, a rear face, and a bottom face that connects the front face and the rear face. The bottom face of each of the at least two of the tread elements has a width between the front face and the rear face that varies between the lateral side and the medial side forming different shapes of the tread elements. A method of manufacturing a sole structure for an article of footwear includes forming an outsole with such nonlinear tread elements.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of, and claims priority to,U.S. Ser. No. 14/141,996, filed on Dec. 27, 2013, the entire disclosureof which is incorporated by reference herein.

TECHNICAL FIELD

The present teachings generally include a sole structure for an articleof footwear, and a method of manufacturing a sole structure for anarticle of footwear.

BACKGROUND

Footwear typically includes a sole configured to be located under awearer's foot to space the foot away from the ground or floor surface.Soles can be designed to provide a desired level of cushioning. Athleticfootwear in particular sometimes utilizes polyurethane foam or otherresilient materials in the sole to provide cushioning. The groundcontact surface of the article of footwear can be configured fordurability. For example, an outsole of a durable material, such asrubber, is sometimes provided at the ground contact surface of thearticle of footwear.

SUMMARY

An article of footwear has a sole structure that includes an outsole.The outsole has a body with a lateral side and a medial side, and aplurality of tread elements extending from the body to establish aground contact surface. At least some of the tread elements extendbetween the lateral side and the medial side and each include a frontface, a rear face, and a bottom face that connects the front face andthe rear face. The bottom face has a width between the front face andthe rear face that varies between the lateral side and the medial sideat least partially in correspondence with a predetermined wear pattern.By designing the outsole with the widths of the tread elements based onthe wear pattern, the outsole is configured to have greater durabilityin the areas where most required.

The present disclosure also describes a sole structure for an article offootwear. The sole structure includes an outsole having a body with alateral side and a medial side. The outsole further includes a pluralityof tread elements extending from the body to establish a ground contactsurface. At least two of the tread elements extend between the lateralside and the medial side. Each of the tread elements include a frontface, a rear face, and a bottom face that connects the front face andthe rear face. The bottom face of each of the two of the tread elementshas a width between the front face and the rear face that varies betweenthe lateral side and the medial side forming different shapes of treadelements.

In one aspect of the present teachings, at least some of the treadelements have an unvarying height, so that different portions of eachtread element between the lateral side and the medial side have asubstantially identical. Thus, due to the varying width of the treadelements, a greater amount of outsole material is thus provided atportions of the tread elements that are subject to the greatest wear,increasing the abrasion resistance of the outsole. In some embodiments,the tread elements extend from the lateral side to the medial side in anonlinear manner, such as a zig-zag manner to establish a herringbonetread pattern.

In another aspect of the present teachings a sole structure for anarticle of footwear includes an outsole that has a body with a lateralside and a medial side. A plurality of tread elements extend from thebody. At least some of the tread elements extend between the lateralside and the medial side and each include a front face, a rear face, anda bottom face that connects the front face and the rear face. The bodyhas a height above at least some of the tread elements that varies atleast partially in correspondence with a predetermined wear pattern.

In another aspect of the present teachings, a sole structure for anarticle of footwear includes a midsole assembly that has a resilientcomponent with a lower surface, a heel region, a lateral side, and amedial side. An outsole is attached to the lower surface of theresilient component. The resilient component has a peripheral surfacethat extends around the heel region and along the lateral side and themedial side. The peripheral surface has a first set of alternatingridges and grooves extending longitudinally forward from the heel regionto a first set of tapered ends. The resilient component has a second setof alternating ridges and grooves interleaved with the first set ofalternating ridges and grooves and extending longitudinally rearward toa second set of tapered ends rearward of the first set of tapered ends.

A method of manufacturing an article of footwear includes forming anoutsole so that at least some tread elements of the outsole extend froma lateral side to a medial side of the outsole, and so that differentportions of bottom faces of the tread elements at a ground contactsurface of the outsole have different widths, different portions of abody of the outsole from which the tread elements extend have differentheights, or both. The different widths of the different portions of thebottom faces and/or the different heights of the body portions arecorrelated with a predetermined wear pattern having at least onerelatively high wear region and at least one relatively low wear region.Because the widths of the tread elements and/or the heights of the bodyportions correlate with the wear zones, the outsole may exhibit greaterdurability and abrasion resistance.

“A,” “an,” “the,” “at least one,” and “one or more” are usedinterchangeably to indicate that at least one of the item is present; aplurality of such items may be present unless the context clearlyindicates otherwise. All numerical values of parameters (e.g., ofquantities or conditions) in this specification, including the appendedclaims, are to be understood as being modified in all instances by theterm “about” whether or not “about” actually appears before thenumerical value. “About” indicates that the stated numerical valueallows some slight imprecision (with some approach to exactness in thevalue; approximately or reasonably close to the value; nearly). If theimprecision provided by “about” is not otherwise understood in the artwith this ordinary meaning, then “about” as used herein indicates atleast variations that may arise from ordinary methods of measuring andusing such parameters. In addition, a disclosure of a range is to beunderstood as specifically disclosing all values and further dividedranges within the range.

The terms “comprising,” “including,” and “having” are inclusive andtherefore specify the presence of stated features, steps, operations,elements, or components, but do not preclude the presence or addition ofone or more other features, steps, operations, elements, or components.Orders of steps, processes, and operations may be altered when possible,and additional or alternative steps may be employed. As used in thisspecification, the term “or” includes any one and all combinations ofthe associated listed items.

Those having ordinary skill in the art will recognize that terms such as“above,” “below,” “upward,” “downward,” “top,” “bottom,” etc., are useddescriptively for the figures, and do not represent limitations on thescope of the invention, as defined by the claims.

The above features and advantages and other features and advantages ofthe present teachings are readily apparent from the following detaileddescription of the best modes for carrying out the present teachingswhen taken in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic bottom view illustration of a sole structure foran article of footwear having an outsole.

FIG. 2 is a schematic illustration in plan view showing the solestructure of FIG. 1.

FIG. 3 is a schematic illustration in side view showing a medial side ofthe sole structure of FIGS. 1 and 2.

FIG. 4 is a schematic illustration in another side view showing alateral side of the sole structure of FIGS. 1 and 2.

FIG. 5 is a schematic illustration in front view of the sole structureof FIGS. 1 and 2.

FIG. 6 is a schematic illustration in rear view of the sole structure ofFIGS. 1 and 2.

FIG. 7 is a schematic illustration in cross-sectional view of the solestructure of FIGS. 1 and 2 taken at lines 7-7 in FIG. 2.

FIG. 8 is a schematic illustration in cross-sectional view of the solestructure of FIGS. 1 and 2 taken at lines 8-8 in FIG. 2.

FIG. 9 is a schematic illustration in cross-sectional view of the solestructure of FIGS. 1 and 2 taken at lines 9-9 in FIG. 2.

FIG. 10 is a schematic illustration in cross-sectional view of the solestructure of FIGS. 1 and 2 taken at lines 10-10 in FIG. 2.

FIG. 11 is a schematic illustration in cross-sectional view of the solestructure of FIGS. 1 and 2 taken at lines 11-11 in FIG. 2.

FIG. 12 is a schematic illustration of a durability map for an articleof footwear showing a wear pattern with different relative wear regions.

FIG. 13 is a schematic illustration in bottom view of the sole structureof FIGS. 1 and 2 showing portions of bottom faces of tread elements ofthe outsole with widths corresponding with the wear regions of the wearmap of FIG. 12.

FIG. 14 is a schematic illustration in fragmentary cross-sectional viewof a tread element taken at lines 14-14 in FIG. 13.

FIG. 15 is a schematic illustration in fragmentary cross-sectional viewof a tread element taken at lines 15-15 in FIG. 13.

FIG. 16 is a schematic illustration in fragmentary cross-sectional viewof a tread element taken at lines 16-16 in FIG. 13.

FIG. 17 is a schematic illustration in fragmentary cross-sectional viewof a tread element taken at lines 17-17 in FIG. 13.

FIG. 18 is a schematic illustration in fragmentary cross-sectional viewof a tread element taken at lines 18-18 in FIG. 13.

FIG. 19 is a schematic illustration in fragmentary cross-sectional viewof a tread element taken at lines 19-19 in FIG. 13.

FIG. 20 is a schematic illustration in fragmentary bottom view of analternative outsole in accordance with another aspect of the presentteachings.

FIG. 21 is a schematic illustration in fragmentary bottom view ofanother alternative outsole in accordance with another aspect of thepresent teachings.

FIG. 22 is a flow diagram of a method of manufacturing the article offootwear with the outsole of any of FIGS. 1, 20, and 21.

FIG. 23 is a schematic bottom view illustration of another embodiment ofa sole structure for an article of footwear having another embodiment ofan outsole.

FIG. 24 is a schematic illustration in plan view showing the solestructure of FIG. 23.

FIG. 25 is a schematic illustration in side view showing a lateral sideof the sole structure of FIGS. 23 and 24.

FIG. 26 is a schematic illustration in another side view showing amedial side of the sole structure of FIGS. 23 and 24.

FIG. 27 is a schematic illustration in front view of the sole structureof FIGS. 23 and 24.

FIG. 28 is a schematic illustration in rear view of the sole structureof FIGS. 23 and 24.

FIG. 29 is a schematic illustration in cross-sectional view of the solestructure of FIGS. 23 and 24 taken at lines 29-29 in FIG. 24.

FIG. 30 is a schematic illustration in cross-sectional view of the solestructure of FIGS. 23 and 24 taken at lines 30-30 in FIG. 24.

FIG. 31 is a schematic illustration in cross-sectional view of the solestructure of FIGS. 23 and 24 taken at lines 31-31 in FIG. 24.

FIG. 32 is a schematic illustration in cross-sectional view of the solestructure of FIGS. 23 and 24 taken at lines 32-32 in FIG. 24.

FIG. 33 is a schematic illustration in cross-sectional view of the solestructure of FIGS. 23 and 24 taken at lines 33-33 in FIG. 24.

FIG. 34 is a schematic illustration in cross-sectional view of the solestructure of FIGS. 23 and 24 taken at lines 34-34 in FIG. 24.

FIG. 35 is a schematic illustration in plan view of one of the treadelements of FIG. 23.

FIG. 36 is a schematic illustration in fragmentary cross-sectional viewof a tread element taken at lines 36-36 in FIGS. 23 and 35.

FIG. 37 is a schematic illustration in fragmentary cross-sectional viewof a tread element taken at lines 37-37 in FIGS. 23 and 35.

DETAILED DESCRIPTION

Referring to the drawings, wherein like reference numbers refer to likecomponents throughout the views, FIG. 1 shows an article of footwear 10that has a sole structure 12 with an outsole 14. The sole structure 12also has a first midsole component 16 secured to the outsole 14. Asfurther discussed herein, the outsole 14 has a body 17 with treadelements 18 that extend from the body 17 to establish a ground contactsurface corresponding with a predetermined wear pattern 19 of thearticle of footwear 10, shown in FIG. 12. Specifically, bottom faces 20of each of the tread elements 18 have a respective width that variesfrom a lateral side 22 to a medial side 24 of the outsole 14 so that thewidth is greater in relatively high wear areas than in relatively lowwear areas. The ground contact surface of the outsole 14 is the totalsurface of the bottom faces 20 of all of the tread elements 18. In otherwords, the bottom faces 20 are configured to be in contact with theground, represented by a ground plane GP shown in FIGS. 4 and 7, as thearticle of footwear 10 is worn on the foot of a human. As indicated inFIGS. 4 and 7, not all of the bottom faces 20 are likely to be incontact with the ground at once, and different portions of the bottomfaces 20 will be in contact with the ground as the wearer's foot movesrelative to the ground.

For purposes of reference, the outsole 14 has a heel region 26, amidfoot region 27, and a forefoot region 28. The midfoot region 27 isbetween the heel region 26 and the forefoot region 28. For purposes ofdiscussion, the heel region 26, the midfoot region 27, and the forefootregion 28 are defined as the rearmost third, the middle third, and theforemost third of the outsole 14. The heel region 26 generally includesportions of the outsole 14 corresponding with rear portions of a humanfoot including the calcaneus bone and of a size corresponding with theoutsole 14 and article of footwear 10. Forefoot region 28 generallyincludes portions of the outsole 14 corresponding with the toes and thejoints connecting the metatarsals with the phalanges of the human footof the size corresponding with the outsole 14 and article of footwear10. Midfoot region 27 generally includes portions of the outsole 14corresponding with an arch area of the human foot of the sizecorresponding with the outsole 14 and article of footwear 10.

As used herein, a lateral side of a component for an article offootwear, such as a lateral side 22 of the outsole 14, is a side thatcorresponds with the side of the foot of the wearer of the article offootwear 10 that is generally further from the other foot of the wearer(i.e., the side closer to the fifth toe of the wearer). The fifth toe iscommonly referred to as the little toe. A medial side of a component foran article of footwear, such as a medial side 24 of the outsole 14, isthe side that corresponds with an inside area of the foot of the wearerand is generally closer to the other foot of the wearer (i.e., the sidecloser to the hallux of the foot of the wearer). The hallux is commonlyreferred to as the big toe. The lateral side 22 and the medial side 24both extend around the periphery of the outsole 14 from the foremostextent 42 to the rearmost extent 44.

In the embodiment of FIG. 1, the tread elements 18 extend nonlinearlyfrom the lateral side 22 to the medial side 24. As used herein,extending “nonlinearly”, in a “nonlinear manner”, or having a “nonlinearconfiguration”, as used with respect to a tread element 18 means thatthe tread element 18 bends or winds lengthwise between the lateral side22 and the medial side 24. When used with respect to a tread element 18,lengthwise means the expanse of the tread element 18 from the lateralside 22 to the medial side 24. A tread element 18 can extend nonlinearlyby having a variety of connected linear segments or connected curvedsegments between the lateral side 22 and the medial side 24. In otherembodiments, only some of the tread elements 18 extend nonlinearly fromthe lateral side 22 to the medial side 24. In still other embodiments,the tread elements 18 extend linearly from the lateral side 22 to themedial side 24. In all of these possible embodiments, at least some ofthe tread elements 18 have bottom faces that vary in width between thefront face and the rear face in correspondence with a predetermined wearpattern.

In the embodiment of FIG. 1, each of the tread elements 18 hasalternating first segments 30 and second segments 32. The first segments30 extend from the lateral side 22 to the medial side 24 generally in afirst direction that is at least partially toward the forefoot region 28of the outsole 14, and the second segments 32 extend from the lateralside 22 to the medial side 24 generally in a second direction that is atleast partially toward the heel region 26. First and second segments 30,32 of one of the tread elements 18 are labeled in FIG. 1 to illustratethis arrangement. With this arrangement, each of the tread elements 18extends in a generally zig-zag manner between the lateral side 22 andthe medial side 24. The article of footwear 10 with the tread elements18 arranged in this manner has what is referred to by those skilled inthe art as a herringbone tread pattern. Optionally, one or more logos orother aesthetic or functional shapes may be molded with or attached tothe bottom side 41 of the outsole 14 or elsewhere on the outsole,interrupting some of the tread elements 18, in which case thoseinterrupted tread elements will not extend continuously from the lateralside 22 to the medial side 24.

In FIG. 2, the outsole 14 is visible near the forefoot region 28 andonly the first midsole component 16 is visible in the heel region 26.The first midsole component 16 extends only over the heel region 26 andmost or all of the midfoot region 27. The sole structure 12 alsoincludes a cushioning insert component 34 that overlays the outsole 14and the first midsole component 16 and extends over the heel region 26,the midfoot region 27 and the forefoot region 28. The outsole 14 may bea thermoplastic rubber or other suitably durable material. The materialfor the outsole 14 may be selected to provide a desirable combination ofdurability and flexibility. The midsole component 16 may be a materialthat combines a desired level of resiliency and support, such as anethylene vinyl acetate (EVA) foam. The insert component 34 may also be acushioning foam component, such as a lighter weight and less rigid foamthan the midsole component 16.

The outsole 14 and midsole component 16 can be secured to one another bythermoforming during a molding process, by thermoplastic layers thatmelt to bond the components, by adhesives, or by any other suitablemanner. A footwear upper (not shown) is secured in any suitable mannerto the sole structure 12. More specifically, the footwear upper issecured to an inner peripheral surface 38 of the outsole 14 near theforefoot region 28, and to an inner peripheral surface 40 of the insertcomponent 34 in the heel region 26. The insert component 34 can besecured to the midsole component 16 and the outsole 14 and has afoot-receiving surface 36. In some embodiments, the footwear upper canalso be secured to the insert component 34.

FIG. 3 illustrates that the tread elements 18 extend from the bottomside 41 of the outsole 14 around to the medial side 24 of the outsole 14and along the entire length of the outsole 14 from the foremost extent42 to the rear most extent 44. FIG. 4 illustrates that the treadelements 18 extend from the bottom side 41 around to the lateral side 22of the outsole 14 and along the entire length of the outsole 14 from theforemost extent 42 to the rear most extent 44. In other embodiments, thetread elements 18 may extend along some of the length between theforemost extent 42 and the rearmost extent 44. FIG. 5 illustrates thatthe tread elements 18 extend from the bottom side 41 around to a toearea surface 46 at the foremost extent 42 of the outsole 14. In each ofthe views, only some of the tread elements 18 are indicated with areference number for clarity. FIGS. 3, 4, and 6 show a pattern ofdimples 48 on an outer surface 50 of the first midsole component 16. Thedimples 48 may provide flexibility and reduce weight, and may be foraesthetic purposes. The first midsole component 16 may instead haveother surface patterns for functionality, aesthetics, or both. FIGS.8-11 show cross-sections through the sole structure 12 that cut throughmultiple ones of the nonlinear tread elements 18.

FIGS. 1, 7, and 14-19 show that each of the tread elements 18 has afront face 52, a rear face 54, and the bottom face 20 that connects thefront face 52 and the rear face 54. The front face 52, rear face 54, andbottom face 20 of each tread element 18 extend continuously between thelateral side 22 and the medial side 24 as is apparent in FIG. 1. Thefront face 52 of each tread element 18 is on the generallyforward-facing side of the tread element 18, which is the side closer tothe forward-most extent 42. The rear face 54 of each tread element 18 ison the generally rearward-facing side of the tread element 18, which isthe side closer to the rearward-most extent 44. As is apparent in FIG.1, the front face 52 and the rear face 54 of each tread element 18 varyin orientation according to the nonlinear shape of the tread element 18.Respective nonlinear grooves 58 are defined in the outsole 14 betweenadjacent ones of the tread elements 18. The outsole 14 can be configuredso that a distance D between segments of at least some consecutive onesof the grooves 58 remains substantially constant from the lateral side22 to the medial side 24, as indicated in FIG. 1. For other ones of thegrooves 58, this distance can vary.

It should be appreciated that although the tread elements 18 areintegrally formed with the body 17 of the outsole 14 in the embodimentshown so that the outsole 14 is a unitary, one-piece component, thetread elements 18 could instead be separately formed and applied to andsecured to the body 17 in other embodiments.

At least some of the tread elements have a bottom face 20 with a widthbetween the front face 52 and the rear face 54 that varies between thelateral side 22 and the medial side 24 in correspondence with apredetermined wear pattern 19 of the article of footwear 10. In theembodiment shown, each tread element 18 has a respective bottom face 20that has different widths W1, W2, W3, W4, W5, or W6 in differentportions of the tread element 18 corresponding with a predetermined wearpattern 19 expected of the outsole 14. The front face 52 and rear face54 of each tread element 18 varies in angle A1, A2, A3, A4, A5, or A6with respect to the body 17 of the outsole 14 as necessary to maintain agenerally planar outer surface along any given segment 30, 32 whileextending between the body 17 and the bottom face 20 with changing widthW1-W6.

FIG. 12 is a durability map 60 showing a wear pattern 19. The wearpattern 19 is the shape and location of numerous wear zones Z1, Z2, Z3,and Z4, also referred to as wear regions or pressure zones, as each isassociated with a different range of wear at different locations of theoutsole tested. As used herein, “wear” is a reduction in thickness inthe outsole 14 and, potentially, reduction in thickness of the midsole16 if wear extends to the midsole 16. The wear pattern 19 is based onwear testing of an outsole while worn on a human foot. Alternatively,wear testing could be carried with the outsole supported on a mechanicalform such as a shoe last. For example, the wear pattern can be developedbased on outsole thickness measurements taken at various locations ofthe outsole over a test period during which the outsole is subjected toa specific physical activity. For example, the article of footwear 10may be used for tennis, in which case the wear pattern is based onmeasurements taken after different periods of tennis play. Thedurability map 60 can be developed using an outsole having any of manydifferent tread patterns, such as a traditional herringbone treadpattern with tread elements of a constant cross-sectional width fromlateral side to medial side. An outsole 14 with tread elements 18corresponding to the wear pattern 19 and configured as described mayhave improved durability in comparison to an outsole with a traditionalherringbone pattern with tread elements of a constant width.

In FIG. 12, the magnitude of the average wear in each wear zone Z1, Z2,Z3, and Z4 is indicated by the density of shading. Accordingly, wearzones Z1 cover the areas that experienced wear in a first, highest rangeof wear. Wear zones Z2 cover areas that experienced wear in a secondrange of wear lower than the first range of wear. Wear zones Z3 coverareas that experienced wear in a third range of wear lower than thesecond range of wear. Wear zones Z4 cover areas that experienced wear ina fourth range of wear lower than the third range of wear. Thus,portions of the outsole within wear zone Z1 have a greater wearcharacteristic than portions of the outsole within wear zone Z4, wherethe wear characteristic is the average wear experienced in the wearzone.

FIGS. 13-19 indicate that the bottom faces 20 of the tread elements 18of the outsole 14 are designed to vary in width between front and rearfaces 52, 54 from the lateral side 22 to the medial side 24 according tothe variation in wear zones Z1-Z4 in the corresponding wear map 60 forthe corresponding portion of the outsole 14. That is, different ones ofthe tread elements 18 have different portions in which the bottom face20 has any one of different widths W1, W2, W3, W4, W5, W6, resulting indifferent cross-sectional profiles of the tread element 18. In theembodiment shown, not all of the tread elements 18 have portions withall of the different widths W1-W6. That is, some of the tread elements18 are of a uniform width W6 from the lateral side 22 to the medial side24, such as those in the arch area at the midfoot region 27 of theoutsole 14. By contrast, some of the tread elements 18 in the heelregion 26 and in the forefoot region 28 have different portions thatcorrespond with each of the zones Z1, Z2, Z3, Z4, and so have each ofthe different widths W1-W6 in progressing between the lateral side 22and the medial side 24. In other embodiments, tread elements 18 designedto reflect different wear patterns may have differently mapped wearzones, may have fewer or more wear zones, and may therefore have treadelements with portions having bottom faces with fewer or more widths. InFIGS. 12 and 13, phantom line L1 generally indicates the boundary ortransition between wear zone Z1 and wear zone Z2, phantom line L2generally indicates the boundary or transition between wear zone Z2 andwear zone Z3, and phantom line L3 generally indicates the boundary ortransition between wear zone Z3 and wear zone Z4.

FIG. 14 shows a cross-section of a portion of a tread element 18 in theforefoot region 28 of the outsole 14. The portion of the tread element18 corresponds with wear zone Z1. The bottom face 20 of the portionshown in FIG. 14 has a width W1. The front face 52 and rear face 54extend perpendicularly from the body 17, at an angle Al of 90 degrees.The tread element 18 extends downward from the body 17 so that it has aheight H. In other words, the tread element 18 elevates the body 17 by adistance H from the ground plane GP of FIG. 7 when the outsole 14 isplaced facing downward, with the bottom surface 20 in contact with theground plane GP.

FIG. 15 shows a cross-section of a portion of the same tread element 18of FIG. 14. The portion of the tread element 18 shown in FIG. 15corresponds with a transition between wear zones Z1 and Z2. The bottomface 20 of the portion shown in FIG. 15 has a width W2 less than widthW1. The front face 52 and rear face 54 extend from the body 17 at anangle A2 greater than 90 degrees. The tread element 18 extends downwardfrom the body 17 so that it has the same height H as in FIG. 14.

FIG. 16 shows a cross-section of a portion of the same tread element 18of FIGS. 14 and 15. The portion of the tread element 18 shown in FIG. 16corresponds with wear zone Z2. The bottom face 20 of the portion shownin FIG. 16 has a width W3 less than width W2. The front face 52 and rearface 54 extend from the body 17 at an angle A3 greater than angle A2.The tread element 18 extends downward from the body 17 so that it hasthe same height H as in FIG. 14.

FIG. 17 shows a cross-section of a portion of the same tread element 18of FIGS. 14-16. The portion of the tread element 18 shown in FIG. 17corresponds with a transition between zones Z2 and Z3. The bottom face20 of the portion shown in FIG. 17 has a width W4 less than width W3.The front face 52 and rear face 54 extend from the body 17, at an angleA4 greater than angle A3. The tread element 18 extends downward from thebody 17 so that it has the same height H as in FIG. 14.

FIG. 18 shows a cross-section of a portion of the same tread element 18of FIGS. 14-17. The portion of the tread element 18 shown in FIG. 18corresponds with wear zone Z3. The bottom face 20 of the portion shownin FIG. 18 has a width W5 less than width W4. The front face 52 and rearface 54 extend from the body 17, at an angle A5 greater than angle A4.The tread element 18 extends downward from the body 17 so that it hasthe same height H as in FIG. 14.

FIG. 19 shows a cross-section of a portion of the same tread element 18of FIGS. 14-18. The portion of the tread element 18 shown in FIG. 19corresponds with wear zone Z4. The bottom face 20 of the portion shownin FIG. 19 has a width W6 less than width W5. The front face 52 and rearface 54 extend from the body 17, at an angle A6 greater than angle A5.The portion of the tread element 18 shown in FIG. 19 can be referred toherein as a first portion in a first wear region (i.e., wear zone Z4),and the portion of the tread element 18 shown in FIG. 14 can be referredto as a second portion in a second wear region (i.e., wear zone Z1), andhas a higher wear characteristic (i.e., amount of wear) than wear zoneZ4. The tread element 18 extends downward from the body 17 so that ithas the same height H as in FIG. 14.

The angles A1-A6 and the corners at transitions between the body 17 andthe faces 54, 56 or between the faces 54, 56 and the bottom face 20 canbe chamfered or rounded for ease in release from within mold cavities ifthe tread elements 18 are molded with the body 17.

FIGS. 14-18 thus illustrate that in areas of relatively low wear, suchas areas corresponding with the wear zone Z4, the tread elements 18 canhave a first portion with a generally trapezoidal cross-sectionalprofile, with the front and rear faces 52, 54 tapering toward oneanother to a peak at the very narrow bottom face 20 serving as theground contact surface. The tread element 18 has a cross-sectionalprofile of an inverted trapezoid in wear zone Z4. In areas of relativelyhigh wear such as areas corresponding with wear zone Z1, the same treadelement 18 can have another portion, such as shown in FIG. 14, referredto herein as a second portion, in which the front and rear faces 52, 54are generally parallel with one another and the tread element 18 has agenerally rectangular cross-sectional profile, so that a width W1 of thebottom face 20 is greater at the second portion than at the firstportion.

As indicated in FIGS. 14-19, the tread element 18 can be configured tohave a substantially identical height H that is unvarying in differentportions in different wear zones and, at least in some tread elements,from the medial side 22 to the lateral side 24. In some embodiments, theheight H need not be unvarying for every tread element 18. Because thesecond portion of the tread element 18 in the relatively high wear zoneZ1 has the same height H but a wider bottom surface 20 as the firstportion in the relatively lower wear zone Z4, the second portion of thetread element 18 has a greater cross-sectional area, and thus morematerial to resist wear and abrasion where most needed, as indicated bythe wear pattern 19. More peaked areas of the tread elements 18, such asthe first portion of the tread element of FIG. 19, may exhibit greatergrip and traction than less peaked areas. By providing both types ofcross-sectional profiles, as well as a variety of additionalcross-sectional profiles shown in FIGS. 15-18 greater durability can beachieved while still providing a desirable amount of grip and traction.Additionally, the height HB of the body 17 above the tread element 18 issubstantially unvarying in different portions of the tread element 18located in different wear zones Z1-Z4. As used herein, the height of thetread elements 18, the height HB of the body 17, or the height of theentire outsole 14 is “substantially unvarying” or “substantiallyidentical” if variation in the height remains within the manufacturingtolerances for the outsole 14. By way of non-limiting example, themanufacturing tolerance for the height of the tread elements 18, theheight HB of the body 17, or the height of the entire outsole 14 may be±5 percent of a specified height dimension.

Referring again to FIGS. 12 and 13, the wear pattern 19 includes arelatively high wear region of wear zone Z1 at the medial side 24 of theforefoot region 28 and a relatively lower wear region of wear zone Z2adjacent the high wear region of wear zone Z1. The respective widths ofthe bottom faces 20 of the tread elements 18 in the forefoot region 28are wider in the generally high wear region of zone Z1 than in therelatively low wear region of zone Z2. The widths are even less in evenlower wear regions of zone Z3 and zone Z4.

The wear pattern 19 also includes a generally U-shaped wear regioncorresponding with the heel region 26. For example, wear zone Z1corresponding with the heel region 26 is generally U-shaped, as is wearzone Z2 and wear zone Z3. The respective widths of the bottom faces 20are wider in the generally U-shaped wear regions of wear zones Z1, Z2,and Z3 in the heel region 28 than in a remainder of the heel region atzone Z4 surrounded by the U-shaped wear region.

FIG. 20 shows an alternative embodiment of an outsole 114 for thearticle of footwear 10. The outsole 114 is alike in all aspects tooutsole 14 with tread elements 118 alike in all aspects to treadelements 18 except that the herringbone pattern of tread elements 118 isslightly different. Transitions 170 between alternating segments 130,132 of each tread element 118 align with corresponding transitions 170of all other tread elements 118 in a linear manner rather than in themanner shown in FIG. 1 with respect to outsole 14 in which thetransitions gradually shift laterally in progressing between theforemost extent 42 and the rear most extent 44.

FIG. 21 is another embodiment of an outsole 214 for the article offootwear 10. The outsole 214 is alike in all aspects to outsole 14except that transitions 270 between alternating segments 230, 232 ofeach tread element 218 are curved and less angular.

FIG. 22 shows a method 300 of manufacturing an outsole for an article offootwear, such as any of the outsoles 14, 114, and 214, as well asoutsole 414 of FIG. 23. The method 300 may include steps 302 and 304,determining a wear pattern 19 of an outsole in step 302 and then, instep 304, designing the outsole to be manufactured so that widths ofdifferent portions of tread elements 18, 118, or 218 at a ground contactsurface of the outsole are correlated with the different wear regions ofthe wear pattern 19, as discussed with respect to FIGS. 12 and 13. Forexample, an outsole can be tested during use of a particular activity,and a wear pattern 60 or expected wear pattern can be determined in step302 for the outsole manufactured according to the method 300.

In step 306, an outsole is then formed according to the widthsdetermined in step 304. Steps 302 and 304 can be performed by the sameentity performing step 306, or by a separate entity. If step 306 isperformed by a separate entity than the entity performing steps 302 and304, information regarding specific dimensions of the widths determinedaccording to steps 302 and 304 can be provided to the entity carryingout step 306, such as in the form of design specifications or moldspecifications if the outsole is to be molded with the tread elements.

Forming the outsole in step 306 is done so that tread elements such astread elements 18, 118, or 218 extend from a lateral side to a medialside of the outsole, and so that portions of bottom faces 20 of thetread elements correlated with a relatively high wear region, such aswear zone Z1 of the wear pattern 19, are wider than portions of thebottom faces of the tread elements correlated with a relatively low wearregion of the wear pattern 19, such as wear zone Z2, Z3, or Z4.

Forming the outsole in step 306 may include sub-step 308, molding theoutsole so that the body 17 and the tread elements 18 are integrallymolded as a unitary component, as in the embodiment of FIG. 1. A moldassembly with mold cavities configured to provide the shape of the treadelements 18 would be used in sub-step 308. Alternatively, the body 17 ofthe outsole 14 can be molded, and the tread elements 18 could beseparately molded or otherwise formed. The tread elements 18 can then beattached to the body 17 by bonding, adhesives, or any other suitablemanner.

FIG. 23 shows an article of footwear 410 that has an alternative solestructure 412 with an alternative outsole 414. The sole structure 412also has a midsole assembly 416 secured to the outsole 414. As furtherdiscussed herein, the outsole 414 has a body 417 with tread elements 418that extend from the body 417 to establish a ground contact surfacegenerally corresponding with the predetermined wear pattern 19 shown inFIG. 12. Specifically, bottom faces 420 of each of the tread elements418 have a respective width that varies between a lateral side 422 to amedial side 424 of the outsole 414 so that the width is greater in atleast some relatively high wear areas than in at least some relativelylow wear areas. The ground contact surface of the outsole 414 is thetotal surface of the bottom faces 420 of all of the tread elements 418.In other words, the bottom faces 420 are configured to be in contactwith the ground, represented by a ground plane GP shown in FIG. 25, asthe article of footwear 410 is worn on the foot of a human. As indicatedin FIG. 25, not all of the bottom faces 420 are likely to be in contactwith the ground at once, and different portions of the bottom faces 420will be in contact with the ground as the wearer's foot moves relativeto the ground.

The outsole 414 is divided into two discontinuous outsole portions 414A,414B. The first outsole portion 414A is generally at a forefoot region428 of the sole structure 412, and the second outsole portion 414B isgenerally at a heel region 426 of the sole structure 412. A midfootregion 427 of the sole structure 412 is not covered by the outsole 414.In FIG. 23, a first layer 470 of the sole structure 412, also referredto herein as a first foam layer or as a resilient component, is exposedbetween the first outsole portion 414A and the second outsole portion414B. The outsole portions 414A, 414B are attached to a lower surface472 of the first layer 470 so that a portion of the lower surface 472 isexposed between the outsole portions 414A, 414B.

For purposes of discussion, the heel region 426 generally includesportions of the sole structure 412 corresponding with rear portions of ahuman foot including the calcaneus bone and of a size corresponding withthe sole structure 412 and article of footwear 410. Forefoot region 428generally includes portions of the sole structure 412 corresponding withthe toes and the joints connecting the metatarsals with the phalanges ofthe human foot of the size corresponding with the sole structure 412 andarticle of footwear 410. Midfoot region 427 generally includes portionsof the sole structure 412 corresponding with an arch area of the humanfoot of the size corresponding with the outsole 414 and article offootwear 410.

The lateral side 422 of the outsole 414 and of the sole structure 412 isa side that corresponds with the side of the foot of the wearer of thearticle of footwear 410 that is generally further from the other foot ofthe wearer (i.e., the side closer to the fifth toe of the wearer). Themedial side 424 of the outsole 414 and of the sole structure 412 is theside that corresponds with an inside area of the foot of the wearer andis generally closer to the other foot of the wearer (i.e., the sidecloser to the hallux of the foot of the wearer). The lateral side 422and the medial side 424 both extend around the periphery of the outsole414 from a foremost extent 442 to a rearmost extent 444.

In the embodiment of FIG. 23, at least some of the tread elements 418extend nonlinearly from the lateral side 422 to the medial side 424. Asused herein, extending “nonlinearly”, in a “nonlinear manner”, or havinga “nonlinear configuration”, as used with respect to a tread element 418means that the tread element 418 bends or winds lengthwise between thelateral side 422 and the medial side 424. When used with respect to atread element 418, lengthwise means the expanse of the tread element 418from the lateral side 422 to the medial side 424. A tread element 418can extend nonlinearly by having a variety of connected linear segmentsor connected curved segments between the lateral side 422 and the medialside 424. In still other embodiments, the tread elements 418 extendlinearly from the lateral side 422 to the medial side 424. In all ofthese possible embodiments, at least some of the tread elements 418 havebottom faces 420 that vary in width between the front face and the rearface in at least partial correspondence with a predetermined wearpattern.

In the embodiment of FIG. 23, each of the tread elements 418 hasalternating first segments 430 and second segments 432. The firstsegments 430 extend from the lateral side 422 to the medial side 424generally in a first direction that is at least partially toward theforefoot region 428 of the outsole 414, and the second segments 432extend from the lateral side 422 to the medial side 424 generally in asecond direction that is at least partially toward the heel region 426.First and second segments 430, 432 of one of the tread elements 418 arelabeled in FIG. 23 to illustrate this arrangement. With thisarrangement, each of the tread elements 418 extends in a generallyzig-zag manner between the lateral side 422 and the medial side 424. Thearticle of footwear 410 with the tread elements 418 arranged in thismanner has what is referred to by those skilled in the art as aherringbone tread pattern. Optionally, one or more logos or otheraesthetic or functional shapes may be molded with or attached to thebottom side 441 of the outsole 414 or elsewhere on the outsole,interrupting some of the tread elements 418, so that the interruptedtread elements do not extend continuously from the lateral side 422 tothe medial side 424. For example, a molded shape 473 for a logo isincluded on the first outsole portion 414A.

FIGS. 23, 25, and 26 together illustrate that the tread elements 418extend from the bottom side 441 of the outsole 414 around to the medialside 424 and the lateral side 422 of the outsole 414. FIG. 27illustrates that the tread elements 418 extend from the bottom side 441around to a toe area surface 446 at the foremost extent 442 of theoutsole 414. In each of the views, only some of the tread elements 418are indicated with a reference number for clarity.

FIGS. 29-34 show cross-sections through the sole structure 412 that cutthrough multiple ones of the nonlinear tread elements 418. It isapparent in FIGS. 29 and 30 that the body 417 of the outsole 414 has afirst body portion 417A corresponding with the first outsole portion414A, and a second body portion 417B corresponding with the secondoutsole portion 414B. The body 417 including body portions 417A, 417B isthe part of the outsole 414 from which the tread elements 418 extend,and are positioned above the tread elements 418.

The outsole 414 is configured so that a height of the body 417 above thetread elements 418 is greater in a relatively high wear region than in arelatively low wear region. In other words, the body 417 has a heightabove at least some of the tread elements 418 that varies at leastpartially in correspondence with the predetermined wear pattern 19 ofFIG. 12. The height of the tread elements 418 extending downward fromthe body 417 can be substantially unvarying from the lateral side 422 tothe medial side 424 or, optionally, can vary. As used herein, the heightof the tread elements 418, the height of the body 417, or the height ofthe entire outsole 414 is “substantially unvarying” or “substantiallyidentical” if variation in the height remains within the manufacturingtolerances for the outsole 414. By way of non-limiting example, themanufacturing tolerance for the height of the tread elements 418, theheight of the body 417, or the height of the entire outsole 414 may be±5 percent of a specified height dimension.

Referring to FIGS. 30 and 36, the first body portion 417A has a heightH1 near the medial side 424 of the forefoot region 428, whichcorresponds with the relatively high wear zone Z1 of FIG. 12. Asindicated in FIGS. 30 and 37, the first body portion 417A has a heightH2 near the center of the forefoot region 428, which corresponds withthe relatively low wear zone Z4. With this configuration, the first bodyportion 417A defines a shelf 474A in the relatively high wear region Z1,and slopes downward from the shelf 474A to the relatively low wearregion Z4, as shown by intermediate sloped portion 476A. The shelf 474Acan extend along the medial side of the first body portion 417A.

The shelf configuration of the body 417 is also apparent in FIG. 29. Thefirst body portion 417A has a height H3 near the foremost extent 442 ofthe forefoot region 428 indicated in FIG. 23, which corresponds with therelatively high wear zone Z1 of FIG. 12. The height H3 may be the sameor different than the height H1 of the body portion 417A at the shelf474A of FIG. 30. The first body portion 417A has a height H4 furtherinward in the forefoot region 428, which corresponds with wear zone Z2,which is a relatively low wear zone in comparison to wear zone Z1. Theheight H4 may be the same or different than the height H2 of FIG. 30.With this configuration, the first body portion 417A defines a shelf474B in the relatively high wear region Z1, and slopes downward from theshelf 474B to the relatively low wear region Z2, as shown byintermediate sloped portion 476B. The shelf 474B can be contiguous withthe shelf 474A, and can extend along the outer periphery of the firstbody portion 417A from the foremost extent of the first body portion417A and along the lateral side 422.

Additionally, as shown in FIG. 29, the second body portion 417B has aheight H5 near the rearmost extent 444 of the sole structure 412 at theheel region 426, which corresponds with the relatively high wear zone Z1of FIG. 12. The height H5 may be the same or different than the heightH1 of the body portion 417A at the shelf 474A of FIG. 30, and the heightH3 of the body portion 417A at the shelf 474B of FIG. 29. The secondbody portion 417B has a height H6 further inward in the heel region 426,which corresponds with wear zone Z2, which is a relatively low wear zonein comparison to wear zone Z1. The height H6 may be the same ordifferent than the height H2 of FIG. 30 and the height H4 of FIG. 29.With this configuration, the second body portion 417B defines a shelf474C in the relatively high wear region Z1, and slopes downward from theshelf 474C to the relatively low wear region Z2, as shown byintermediate sloped portion 476C. The shelf 474C may extend generallyalong the outer periphery of the U-shaped second body portion 419B atthe medial side 424. Alternatively, the shelf 474C can be generallyU-shaped, and can extend along the outer periphery of the U-shapedsecond body portion 417B at both the medial side 424, the lateral side422, and along the rear portion of the heel region 426 between themedial side 424 and the lateral side 422.

FIGS. 23 and 35-37 show that each of the tread elements 418 has a frontface 452, a rear face 454, and the bottom face 420 that connects thefront face 452 and the rear face 454. The front face 452, rear face 454,and bottom face 420 of at least some of the tread elements 418 extendcontinuously between the lateral side 422 and the medial side 424 as isapparent in FIG. 23. The front face 452 of each tread element 418 is onthe generally forward-facing side of the tread element 418, which is theside closer to the forward-most extent 442. The rear face 454 of eachtread element 418 is on the generally rearward-facing side of the treadelement 418, which is the side closer to the rearward-most extent 444.As is apparent in FIG. 23, the front face 452 and the rear face 454 ofeach tread element 418 vary in orientation according to the nonlinearshape of the tread element 418.

Referring to FIG. 23, the outsole 414 forms a recess 462 in the firstbody portion 417A that extends transversely across several of the treadelements 418. The recess 462 is a recession in both the first outsoleportion 414A and a stiffening member 484 with the first foam layer 470as shown in FIG. 30. FIG. 23 also shows that the outsole forms a recess464 in the second body portion 417B that extends transversely acrossseveral of the tread elements 418. The recess 464 is a recession in thesecond outsole portion 414B. The recesses 462, 464 extend generallylongitudinally, and provide increased flexibility. The recesses 462, 464may be referred to as flex grooves.

A first set of nonlinear grooves 458 are defined in the outsole 414,each between adjacent ones of the tread elements 418. The nonlineargrooves 458 extend between the medial side 424 and the lateral side 422,and extend completely from the medial side 424 to the lateral side 422if adjacent those ones of the tread elements 418 that extend completelyfrom the medial side 424 to the lateral side 422. A second set ofnonlinear grooves 459 are also defined in the outsole 414, but each ofthe nonlinear grooves 459 extends only partway between the medial side424 and the lateral side 422. None of the nonlinear grooves 459intersect the nonlinear grooves 458. Each nonlinear groove 459 splits orbisects a portion of a respective tread element 418 into a firstsubtread 418A and a second subtread 418B as best illustrated in FIG. 35.Successive nonlinear grooves 458 remain generally equally spaced fromone another when extending transversely between the medial side 424 tothe lateral side 422. Each nonlinear groove 459 reduces the width of thebottom surface 420 of the tread element 418 at the subtreads 418A, 418Bin comparison to the width W7 of the tread element 418 (shown in FIG.30) in the portion not split into subtreads 418A, 418B. That is, the sumof the width W8 of the first subtread 418A and the width W9 of thesecond subtread 418B (shown in FIG. 37) is less than the width W7. Bydecreasing the width of the tread elements 418 in relatively low wearareas, the second set of nonlinear grooves 459 therefore enable thewidths of the tread elements 418 to at least partially correspond withthe wear pattern 19.

It should be appreciated that although the tread elements 418 areintegrally formed with the body 417 of the outsole 414 in the embodimentshown, the tread elements 418 could instead be separately formed andapplied to and secured to the body 417 in other embodiments.

The front face 452 and rear face 454 of each tread element 418 aregenerally orthogonal to the body 417 of the outsole 414 so that aconsistent right angle A7 is formed, and the tread element 418 has agenerally rectangular cross-sectional profile in the portion not splitby the groove 459, as shown in FIG. 36. Two adjacent generallyrectangular shapes are thus formed in the cross-sectional profile of theportion of the tread element 418 split by the groove 459, as shown inFIG. 37. By providing both types of cross-sectional profiles shown inFIGS. 36 and 37, greater durability can be achieved while stillproviding a desirable amount of grip and traction. That is, a relativelywide portion of the tread element 418 at the relatively high wear areaprovides increased durability, whereas the relatively thin portion ofthe tread element in the relatively low wear area, with the groove 459adjacent thereto, increases grip and traction.

Referring to FIG. 29, the midsole assembly 416 includes the first foamlayer 470 with the lower surface 472 to which the outsole 414 issecured. The midsole assembly 416 also has a second foam layer 480positioned on and partially surrounded by the first foam layer 470. Thefirst and second foam layers 470, 480 can be an EVA or other type ofresilient foam. The first foam layer 470 is configured to be a stifferfoam than the second foam layer 480. This provides necessary supportaround the perimeter of the foot, while providing comfort and cushioningmore immediately adjacent the foot.

As best shown in FIGS. 23 and 32, the first foam layer 470 has a pair ofslots 482 extending through the first foam layer 470 in the exposed areaof the midfoot region 427. The midsole assembly 416 also includes astiffening member 484 positioned between the first foam layer 470 andthe second foam layer 480. The stiffening member 484 has ribs 486 thatextend through the slots 482 of the first foam layer 470 so that theribs 486 are partially exposed. The stiffening member 484 and the ribs486 are stiffer than the first foam layer 470 and the second foam layer480. The stiffening member 484 and ribs 486 can be a thermoplasticpolyurethane material. The stiffening member 484 and ribs 486 provideincreased support in the midfoot region 427. The stiffening member 484also extends partially into the forefoot region 428, as indicated byFIG. 30, and into the heel region 426 as indicated by FIG. 33. As shownin FIGS. 24-26 and 31, the midsole assembly 416 also includes a lip 488extending upward along a portion of the lateral side 422 of the firstfoam layer 470. The lip 488 is stiffer than the first foam layer 470.For example, the lip 488 can be a thermoplastic polyurethane material.

With reference to FIGS. 25 and 26, the first foam layer 470, alsoreferred to as a resilient component, has a heel region 490 and aperipheral surface 492 that extends around the heel region 490 and has alateral side and a medial side extending along the lateral side 422 andthe medial side 424, respectively. The first foam layer 470 is molded orotherwise formed so that the peripheral surface 492 has a first set ofalternating ridges 494A and grooves 496A extending longitudinallyforward from the heel region 490 to a first set of tapered ends 498A.

As shown in FIG. 25, the first foam layer 470 is also molded orotherwise formed so that the peripheral surface 492 has a second set ofalternating ridges 494B and grooves 496B interleaved with the first setof alternating ridges 494A and grooves 496A on the lateral side 422.Tapered ends 498B of the second set of ridges 494B and grooves 496B arerearward of the tapered ends 498A. The tapered ends 498B are referred toherein as a second set of tapered ends. As shown in FIG. 25, a portionof the second layer 480 extends at least partially forward of the firstlayer 470. Some of the alternating ridges and grooves 494B, 496Bcontinue in the portion of the second layer 480 that extends forward ofthe first layer 470, so at least some of other tapered ends 498C of thesecond set of ridges 494B (i.e., ends opposite the tapered ends 498B)and grooves 496B are formed in the peripheral surface of the secondlayer 480. As shown in FIG. 26, the peripheral surface 492 of the firstfoam layer 470 is also molded or otherwise formed so that a third set ofalternating ridges 494C and grooves 496C are interleaved with the firstset of ridges 494A and grooves 496A on the medial side 424.

With the peripheral surface 492 of the first foam layer 470 configuredas described with various sets of interleaved ridges and grooves, theperipheral surface resembles an accordion shape with a series of pleatsand folds. During use, the resilient material of the first and secondfoam layers 470, 480 allows the ridges 494A, 494B, 494C to compressunder loads and spring back to the extended positions shown in thedrawings. The interleaved construction of the sets of ridges and groovesprovides resiliency in the heel region 426 and the midfoot region 427.The larger ridges 494A in the heel region 490 allow increased energyabsorbing and resilient compression under load. The tapering of theridges 494A at the midfoot region 427 results in relatively lesscompression under load, and greater support, in the midfoot region 427.

The outsole 414 and midsole assembly 416 can be secured to one anotherby thermoforming during a molding process, by thermoplastic layers thatmelt to bond the components, by adhesives, or by any other suitablemanner. A footwear upper (not shown) is secured in any suitable mannerto the sole structure 412. More specifically and with reference to FIG.24, a footwear upper and strobel unit can be secured to a foot-receivingsurface 436 of the second foam layer 480, an inner peripheral surface438 of the outsole 414 near the forefoot region 428, and to an innerperipheral surface 440 of the midsole assembly 416.

The method 300 of FIG. 22 may be carried out to manufacture the articleof footwear 410. The wear pattern 19 of an outsole can be determined instep 302 and then, in step 304, the outsole 414 can be designed to bemanufactured so that widths of different portions of tread elements 418at a ground contact surface of the outsole 414 are correlated with thedifferent wear regions of the wear pattern 19, as discussed with respectto FIG. 23. Under the method 300, the height of the body 417 of theoutsole 414 can also be designed to vary with the predetermined wearpattern 19, so that a relatively high wear area has a height greaterthan a relatively low wear area, creating a wear shelf 476A, 476B, 476C,as described with respect to FIGS. 29 and 30. In step 306, an outsole414 is then formed according to the widths determined in step 304 andthe heights determined as described with respect to FIGS. 29 and 30.Steps 302 and 304 can be performed by the same entity performing step306, or by a separate entity. If step 306 is performed by a separateentity than the entity performing steps 302 and 304, informationregarding specific dimensions of the widths and heights can be providedto the entity carrying out step 306, such as in the form of designspecifications or mold specifications if the outsole is to be moldedwith the tread elements.

Forming the outsole in step 306 is done so that at least some of thetread elements 418 extend from the lateral side 422 to the medial side424 of the outsole, and so that portions of bottom faces 420 of at leastsome of the tread elements 418 correlated with a relatively high wearregion, such as wear zone Z1 of the wear pattern 19, are wider thanportions of the bottom faces of the tread elements 418 correlated with arelatively low wear region of the wear pattern 19, such as wear zone Z2,Z3, or Z4.

Forming the outsole in step 306 may include sub-step 308, molding theoutsole so that the body portions 417A, 417B and the tread elements 418are integrally molded, as in the embodiment of FIG. 23. A mold assemblywith mold cavities configured to provide the shape of the tread elements418 would be used in sub-step 308. Alternatively, the body portions417A, 417B of the outsole 414 can be molded, and the tread elements 418could be separately molded or otherwise formed. The tread elements 418can then be attached to the body portions 417A, 417B by bonding,adhesives, or any other suitable manner.

Accordingly, an article of footwear 10 or 410 is provided according tothe method 300 with an outsole 14, 114, 214, or 414 configured forsuperior durability and abrasion resistance due to the configuration ofthe tread elements having portions with different widths correspondingto expected wear regions of the outsole, as determined by a wear map.With respect to the outsole 414, the different heights of body portions417A, 417B corresponding with the wear map 19 also contribute toincreased durability and abrasion resistance.

While the best modes for carrying out the many aspects of the presentteachings have been described in detail, those familiar with the art towhich these teachings relate will recognize various alternative aspectsfor practicing the present teachings that are within the scope of theappended claims.

1. A sole structure for an article of footwear, the sole structurecomprising: an outsole having: a body with a lateral side and a medialside; a plurality of tread elements extending from the body to establisha ground contact surface; wherein at least two of the tread elementsextend between the lateral side and the medial side and each include afront face, a rear face, and a bottom face that connects the front faceand the rear face; and wherein the bottom face of each of the at leasttwo of the tread elements has a width between the front face and therear face that varies between the lateral side and the medial sideforming different shapes of the tread elements.
 2. The sole structure ofclaim 1, wherein a first set of nonlinear grooves is defined in theoutsole; wherein the nonlinear grooves of the first set extend from thelateral side to the medial side and separate adjacent ones of the treadelements; wherein a second set of nonlinear grooves is defined in theoutsole; and wherein the nonlinear grooves of the second set extend onlypartway between the lateral side and the medial side withoutintersecting the first set of nonlinear grooves to thereby split each ofsaid at least two of the tread elements into a first subtread and secondsubtread.
 3. The sole structure of any of claim 2, wherein the outsolehas a heel region and a forefoot region; and wherein the body of theoutsole is divided into a first body portion at the forefoot region anda second body portion at the heel region; and wherein the first bodyportion is discontinuous from the second body portion.
 4. The solestructure of claim 3, further comprising: a midsole assembly; whereinthe outsole is attached to a lower surface of the midsole assembly; andwherein a portion of the lower surface of the midsole assembly isexposed between the first body portion and the second body portion ofthe outsole.
 5. The sole structure of claim 4, wherein the midsoleassembly has a first layer defining the lower surface; wherein the firstlayer has slots exposed between the first body portion and the secondbody portion; and wherein the midsole assembly has ribs extendingthrough the slots; and wherein the ribs are stiffer than the firstlayer.
 6. The sole structure of claim 5, wherein the midsole assemblyhas: a first foam layer defining the lower surface; wherein the firstfoam layer has slots exposed between the first body portion and thesecond body portion; a second foam layer positioned on and partiallysurrounded by the first foam layer; wherein the first foam layer isstiffer than the second foam layer; the ribs extending through the slotsof the first foam layer; wherein the ribs are stiffer than the firstfoam layer; a lip extending from the first foam layer; and wherein thelip is stiffer than the first foam layer.
 7. The sole structure of claim3, wherein the outsole has a recess traversing multiple ones of thetread elements that extend from the first body portion.
 8. The solestructure of claim 3, wherein the second body portion is generallyU-shaped.
 9. The sole structure of claim 3, wherein the outsole has arecess traversing multiple ones of the tread elements that extend fromthe second body portion.
 10. The sole structure of claim 3, wherein theoutsole has a generally high wear region and a generally low wear regionadjacent the generally high wear region; and wherein a height of thebody above the tread elements is greater in the generally high wearregion than in the generally low wear region.
 11. The sole structure ofclaim 10, wherein the body defines a shelf in the generally high wearregion; and wherein the body slopes downward from the shelf to thegenerally low wear region.
 12. The sole structure of claim 1, furthercomprising: a midsole assembly having a resilient component with a lowersurface; wherein the outsole is attached to the lower surface of theresilient component; wherein the resilient component has a peripheralsurface with a heel region; wherein the peripheral surface has a firstset of alternating ridges and grooves extending longitudinally forwardfrom the heel region to a first set of tapered ends; and wherein theresilient component has a second set of alternating ridges and groovesinterleaved with the first set of alternating ridges and grooves. 13.The sole structure of claim 12, wherein the resilient component is afirst layer; wherein the midsole assembly has a second layer positionedon and partially surrounded by the first layer; wherein a portion of thesecond layer extends at least partially forward of the first layer; andwherein at least some of the alternating ridges and grooves of at leastone of the first and second sets continue in the portion of the secondlayer that extends at least partially forward of the first layer. 14.The sole structure of claim 1, wherein a first set of nonlinear groovesis defined in the outsole; wherein the nonlinear grooves of the firstset extend continuously from the lateral side to the medial side andseparate adjacent ones of the tread elements; and wherein a second setof nonlinear grooves is defined in the outsole; and wherein thenonlinear grooves of the second set extend only partway between thelateral side and the medial side without intersecting the first set ofnonlinear grooves.
 15. The sole structure of claim 1, furthercomprising: a midsole assembly, wherein the outsole is attached to alower surface of the midsole assembly; a first foam layer defining thelower surface, wherein the first foam layer has slots; a second foamlayer positioned on and partially surrounded by the first foam layer,wherein the first foam layer is stiffer than the second foam layer; andwherein the midsole assembly includes a stiffening member positionedbetween the first foam layer and the second foam layer, the stiffeningmember has ribs that extend through the slots of the first foam layer sothat the ribs are partially exposed.
 16. The sole structure of claim 15,wherein the stiffening member and the ribs are stiffer than the firstfoam layer and the second foam layer, and the stiffening member alsoextends partially into a forefoot region of the outsole.
 17. A method ofmanufacturing a sole structure for an article of footwear comprising:forming an outsole for an article of footwear with a body and with treadelements extending from the body; wherein said forming is so that atleast two tread elements of the outsole extend from a lateral side to amedial side of the outsole, and so that different portions of bottomfaces of said at least two of the tread elements at a ground contactsurface of the outsole have different widths, different portions of thebody has different heights, or both; and wherein the different widths ofthe different portions of the bottom faces and the different heights ofthe body are correlated with a predetermined wear pattern having atleast one relatively high wear region and at least one relatively lowwear region.
 18. The method of claim 17, further comprising: determiningthe wear pattern.
 19. The method of any of claim 17, further comprising:correlating the different widths of the different portions of the treadelements or the different heights of the different portions body withthe predetermined wear pattern.
 20. The method of claim 17, whereinforming the outsole is by molding a body of the outsole integrally withthe tread elements.